RCCrawler Forums

Yuendawg · 03-15-2015, 01:57 PM

I've been upgrading the yeti and recently replaced the motor mount and spur gear with an STRC mount and Axial 60 teeth metal gear. I noticed that after I updated the motor mount...the truck seems to stutter quite a bit before I try to accelerate to full power. Its just not very smooth anymore...feels like I have to go full throttle to get the truck to move. It also doesn't seem to be getting full power and looks like I have less torque than before. I thought I didn't adjust the slipper correctly but, I don't think that is the case now. I've tried everything that make sense to me but not getting it run like before.

Any suggestions?

Cultus · 03-15-2015, 02:03 PM

It sounds like maybe your pinion/spur gear mesh is too tight. have you checked that?

RichMTB01 · 03-15-2015, 02:04 PM

I'm assuming you're talking about the RTR with the Vanguard/Castle electronics?

First off, check your gear mesh and that little plastic bushing that the spur rides on. I switched mine out to an actual bearing

Next, you are running a sensorless set up, which is prone to cogging. Now with the added weight of the steel spur, that sound/noise and cogging is amplified causing a lack of power on startup.

Sent from my iPhone using Tapatalk

desertdude · 03-15-2015, 02:51 PM

His Axial 60 teeth metal gear sould have came with a bearing. soulds like gear mesh is alittle to tight.
keep us updated

Yuendawg · 03-15-2015, 03:04 PM

I've adjusted the gear mesh to be looser and tighter. Same results every time ...big time cogging. If I run it with no load ( on a stand, lifted), this seems fine. Everything had been working fine prior to me switching out the motor mount. I've taken everything off again to check and everything looks good.

Could the stock motor have gone bad?

desertdude · 03-15-2015, 03:42 PM

I would switch back to the plastic motor mount, if its runs bad still, ya maybe the motor, that is just my opinion

Brandon · 03-16-2015, 10:38 AM

Check all the connections of the gold plugs on the motor, you might have to remove the heat shrink to inspect them.

Yuendawg · 03-16-2015, 06:23 PM

@Brandon -- I stripped back the connectors and the connections look solid.

I'm gonna try my MMP and see if that helps.

LSXGMC · 03-16-2015, 06:38 PM

My STRC motor mount was ever so slightly thicker than the plastic motor mount (I'm not the only one who has had this issue, and I've heard the Axial aluminum mount is no different). I had to grind down the "fins" on the slipper clutch plate so that it cleared the spur gear cover back plate. If that's binding it could be causing you issues. I wouldn't think it'd be that bad. You'll know of its been binding, there will be markings. As an alternative you might be able to grind the plastic on the rear Spur gear cover plate (the one that bolts to the motor mount, installed before the spur gear) to avoid the binding as well.

Yuendawg · 03-16-2015, 08:52 PM

Thanks. I'm gonna go back to the plastic mount and See if that works.

Yuendawg · 03-18-2015, 03:47 PM

I changed back to the stock mount. Same issue. Anything else to try?

Cultus · 03-18-2015, 04:21 PM

maybe try pulling the motor and seeing if the drivetrain spins freely? or possibly pull the tranny and checking it and the diffs separately. just thinking maybe there is a bad bearing somewhere that is binding up?

Cultus · 03-18-2015, 04:23 PM

oh and while its off you can try running the motor without any load.

Yuendawg · 03-18-2015, 06:12 PM

When I run it off the ground, It looks to accelerate fine..no cogging. I've looked at the tranny and when I have the motor pinion off, the tranny rolls fine. Doesn't seem to have the any issues. Right now, I feel like it's the motor or esc. Just sucks......

JesterSpec · 03-18-2015, 06:49 PM

Wires crossed?

Yuendawg · 03-18-2015, 08:57 PM

Double check the wiring...

Yuendawg · 03-19-2015, 08:02 PM

I found the problem! It looks like the castle BEC I installed caused all my issues. For some reason, it interfered with the esc. Once I removed it, all the power came back like before. Not sure why. I'm pretty sure that I wired it all up correctly.

Any run into this before?

MeanTT · 03-19-2015, 08:49 PM

Quote:

Originally Posted by Yuendawg

I found the problem! It looks like the castle BEC I installed caused all my issues. For some reason, it interfered with the esc. Once I removed it, all the power came back like before. Not sure why. I'm pretty sure that I wired it all up correctly.

Any run into this before?

Because you didn't remove the red wire going to your received perhaps? That may do you in.

Yuendawg · 03-19-2015, 09:12 PM

I did take the red wire off the esc wire...the middle pin according to the Castle instructions.

I appreciate all the input guys.

Rockwolf · 03-19-2015, 10:52 PM

Even though I was no help at all, I am happy to hear that you got it figured out!

03-15-2015, 01:57 PM	#1
Yuendawg Newbie Join Date: Jul 2014 Location: Philly Posts: 24	Yeti problem.... I've been upgrading the yeti and recently replaced the motor mount and spur gear with an STRC mount and Axial 60 teeth metal gear. I noticed that after I updated the motor mount...the truck seems to stutter quite a bit before I try to accelerate to full power. Its just not very smooth anymore...feels like I have to go full throttle to get the truck to move. It also doesn't seem to be getting full power and looks like I have less torque than before. I thought I didn't adjust the slipper correctly but, I don't think that is the case now. I've tried everything that make sense to me but not getting it run like before. Any suggestions?

03-15-2015, 02:03 PM	#2
Cultus Quarry Creeper Join Date: Jun 2013 Location: Canada Posts: 403	Re: Yeti problem.... It sounds like maybe your pinion/spur gear mesh is too tight. have you checked that?

03-15-2015, 02:04 PM	#3
RichMTB01 Quarry Creeper Join Date: Sep 2012 Location: Orange County, CA Posts: 477	Re: Yeti problem.... I'm assuming you're talking about the RTR with the Vanguard/Castle electronics? First off, check your gear mesh and that little plastic bushing that the spur rides on. I switched mine out to an actual bearing Next, you are running a sensorless set up, which is prone to cogging. Now with the added weight of the steel spur, that sound/noise and cogging is amplified causing a lack of power on startup. Sent from my iPhone using Tapatalk

03-15-2015, 02:51 PM	#4
desertdude Rock Crawler Join Date: Aug 2011 Location: SB Posts: 556	Re: Yeti problem.... His Axial 60 teeth metal gear sould have came with a bearing. soulds like gear mesh is alittle to tight. keep us updated Last edited by desertdude; 03-15-2015 at 02:55 PM.

03-15-2015, 03:04 PM	#5
Yuendawg Newbie Join Date: Jul 2014 Location: Philly Posts: 24	Re: Yeti problem.... I've adjusted the gear mesh to be looser and tighter. Same results every time ...big time cogging. If I run it with no load ( on a stand, lifted), this seems fine. Everything had been working fine prior to me switching out the motor mount. I've taken everything off again to check and everything looks good. Could the stock motor have gone bad?

03-15-2015, 03:42 PM	#6
desertdude Rock Crawler Join Date: Aug 2011 Location: SB Posts: 556	Re: Yeti problem.... I would switch back to the plastic motor mount, if its runs bad still, ya maybe the motor, that is just my opinion

03-16-2015, 10:38 AM	#7
Brandon Im Brandon Join Date: Feb 2005 Location: Colfax, CA Posts: 8,156	Re: Yeti problem.... Check all the connections of the gold plugs on the motor, you might have to remove the heat shrink to inspect them.

03-16-2015, 06:23 PM	#8
Yuendawg Newbie Join Date: Jul 2014 Location: Philly Posts: 24	Re: Yeti problem.... @Brandon -- I stripped back the connectors and the connections look solid. I'm gonna try my MMP and see if that helps.

03-16-2015, 06:38 PM	#9
LSXGMC RCC Addict Join Date: Sep 2014 Location: Alberta Posts: 1,116	Re: Yeti problem.... My STRC motor mount was ever so slightly thicker than the plastic motor mount (I'm not the only one who has had this issue, and I've heard the Axial aluminum mount is no different). I had to grind down the "fins" on the slipper clutch plate so that it cleared the spur gear cover back plate. If that's binding it could be causing you issues. I wouldn't think it'd be that bad. You'll know of its been binding, there will be markings. As an alternative you might be able to grind the plastic on the rear Spur gear cover plate (the one that bolts to the motor mount, installed before the spur gear) to avoid the binding as well.

03-16-2015, 08:52 PM	#10
Yuendawg Newbie Join Date: Jul 2014 Location: Philly Posts: 24	Re: Yeti problem.... Thanks. I'm gonna go back to the plastic mount and See if that works.

03-18-2015, 03:47 PM	#11
Yuendawg Newbie Join Date: Jul 2014 Location: Philly Posts: 24	Re: Yeti problem.... I changed back to the stock mount. Same issue. Anything else to try?

03-18-2015, 04:21 PM	#12
Cultus Quarry Creeper Join Date: Jun 2013 Location: Canada Posts: 403	Re: Yeti problem.... maybe try pulling the motor and seeing if the drivetrain spins freely? or possibly pull the tranny and checking it and the diffs separately. just thinking maybe there is a bad bearing somewhere that is binding up?

03-18-2015, 04:23 PM	#13
Cultus Quarry Creeper Join Date: Jun 2013 Location: Canada Posts: 403	Re: Yeti problem.... oh and while its off you can try running the motor without any load.

03-18-2015, 06:12 PM	#14
Yuendawg Newbie Join Date: Jul 2014 Location: Philly Posts: 24	Re: Yeti problem.... When I run it off the ground, It looks to accelerate fine..no cogging. I've looked at the tranny and when I have the motor pinion off, the tranny rolls fine. Doesn't seem to have the any issues. Right now, I feel like it's the motor or esc. Just sucks......

03-18-2015, 06:49 PM	#15
JesterSpec RCC Addict Join Date: Nov 2009 Location: New Wilmington, PA Posts: 1,234	Re: Yeti problem.... Wires crossed?

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03-18-2015, 08:57 PM	#16
Yuendawg Newbie Join Date: Jul 2014 Location: Philly Posts: 24	Re: Yeti problem.... Double check the wiring...

03-19-2015, 08:02 PM	#17
Yuendawg Newbie Join Date: Jul 2014 Location: Philly Posts: 24	Re: Yeti problem.... I found the problem! It looks like the castle BEC I installed caused all my issues. For some reason, it interfered with the esc. Once I removed it, all the power came back like before. Not sure why. I'm pretty sure that I wired it all up correctly. Any run into this before?

03-19-2015, 09:12 PM	#19
Yuendawg Newbie Join Date: Jul 2014 Location: Philly Posts: 24	Re: Yeti problem.... I did take the red wire off the esc wire...the middle pin according to the Castle instructions. I appreciate all the input guys.

03-19-2015, 10:52 PM	#20
Rockwolf Quarry Creeper Join Date: Jan 2011 Location: Michigan Posts: 237	Re: Yeti problem.... Even though I was no help at all, I am happy to hear that you got it figured out!

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